JPH0330369B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dental microvacuum handpiece equipped with a backflow valve that causes compressed air ejected into a ventilator tube to flow back into a suction path and ejected from the tip of a pipette.

The applicant previously introduced in patent application No. 58-88951 a dental micro vacuum handpiece that can suction water, chemicals, dirt, etc. inside the root canal, and clean and dry the inside of the root canal. did. The basic structure of the handpiece is as shown in FIG. Water, chemical solutions, filth, etc. are sucked into the hose 1 via the suction path 7 and the ventilate pipe 8.
6.

However, in the dental microvacuum handpiece of the present applicant's invention, the tip of the pipette may become clogged with dirt or the like. Whenever this clogging occurs, the pipette must be removed and the clogged dirt must be removed using a thin wire or the like. This operation is extremely troublesome for the operator, and it has been desired to provide a dental microvacuum handpiece that can easily clear the blockage.

The present invention has been made in view of the above circumstances, and its features are that the compressed air path that sends compressed air to the ventilate tube is closed to the compressed air path and the ventilary tube, and the compressed air and water
A valve is provided that communicates with the suction path that sucks out chemical solutions, dirt, etc., and the compressed air that is ejected into the ventilate tube flows back into the suction path, and is ejected from the tip of the pipette to blow out the dirt, etc. that has clogged the pipette, and clear the blockage. It is something to do.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a longitudinal cross-sectional view of the handpiece according to the present invention during suction, and FIG. 3 is a longitudinal cross-sectional view of the handpiece during backflow according to the present invention. 1' is a dental microvacuum handpiece with a backflow valve according to the present invention, 2 is a head part in which an adapter 12 with a pipette 10 attached to a small diameter tube 11 is interchangeably fixed by a threaded part 13; The rear part 3 has a connection part that is the same as the one-touch coupler type connection part of a dental high-speed turbine handpiece that cuts teeth, and 6 has water whose flow rate is adjusted by a flow rate adjustment screw (not shown). The water channel 11 is a water inlet that spouts water. The above is the same as the dental microvacuum handpiece of the previous invention.

A slidable valve rod 21 is inserted into a valve body 24 consisting of a valve cap 22 and a valve shaft 23 via a spring 29.
is slidably inserted into the valve case 25 via a spring 30 to form the backflow valve 20. This backflow valve 20 is inserted into a negative pressure generator 28 provided outside the rear part 3 of the handpiece and connected to the rear part, and fixed with a retaining screw 33. 26 is a communication hole that communicates between the inside and outside of the valve shaft 23, 27 is a communication hole that communicates between the inside and outside of the valve case 25, 31 is a retaining stage for the valve rod 21, 32 is a retainer ring for the valve shaft 23, 34, 35, 36 ,37,38
is an O-ring.

According to the present invention constructed as described above, when the backflow valve 20 is opened, the compressed air passes through the compressed air passage 5 and the communication holes 26 and 27, and is ejected from the compressed air passage 5 of the valve shaft 23 to the ventilate tube 8. Therefore, a negative pressure is generated in the negative pressure section 9, and water, chemical solution, dirt, etc. are sucked from the pipette 10. Next, when the backflow valve 20 is closed, that is, the valve rod 21 and the valve body 24 are pressed together, the valve rod 21 closes the communication hole 26 and the valve shaft 23 closes the ventilary tube 8. At the same time, the O-ring 36 is separated from the inner peripheral surface of the valve case 25 and communicates the compressed air path 5 with the suction path 7. The compressed air therefore flows back into the suction channel 7 and is ejected from the pipette 10. As a result, dirt and the like stuck at the tip of the pipette 10 are blown away.

As explained above, according to the present invention, when the pipette is clogged with dirt, etc., it is possible to blow out the dirt, etc. by simply pressing the backflow valve. This eliminates the complicated work of removing dirt using thin wires.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of the dental microvacuum handpiece of the previous invention, Fig. 2 is a longitudinal sectional view of the handpiece of the invention during suction, and Fig. 3 is a longitudinal sectional view of the handpiece of the invention during backflow. A vertical cross-sectional view of the piece. 5...Compressed air path, 7...Suction path, 8...Venture tube, 10...Pipette, 20...Reverse flow valve, 21...Valve rod, 24...Valve body, 25...Valve case.

Claims (1)

[Claims] 1 In a negative pressure generation device using a ventilate tube, the compressed air path of the valve shaft that blows out compressed air toward the ventilic tube is blocked in the compressed air path that sends compressed air to the ventilic tube to destroy the negative pressure. In this state, the ventilary tube and the suction path are blocked by the valve shaft, and the compressed air path that sends compressed air to the valve shaft is opened to the suction path to supply compressed air to the suction path. A dental microvacuum handpiece with a backflow valve, characterized by being equipped with a valve.